Black Box 2x4 DVI Matrix Switch With AudioThe Black Box 2x4 DVI Matrix Switch With Audio is engineered to streamline how you route video and sound across multiple displays. Perfect for digital signage, corporate lobbies, classroom AV setups, or retail environments, this compact matrix switch lets you route two DVI video sources with embedded audio to four DVI displays and speakers with simple, reliable control. Whether you need synchronized playback across a wall of screens or flexible source